General Error In Media Player 9

> My Windows Media Player 9 always gives me an error
> whenever i try to play any video or audio (except mp3)
> files. I tried everything to correct this problem
> including reinstalling the software and getting rid of
> RealPlayer. This problem also occurs with my realplayer.
> My soundcard drivers are up to date. The following is the
> information on my system:
>
> Error Message Number: 8007007E
> Error Message: "The Specified Module Could Not Be Found"
> My Opperating System: Windows XP
> Version of Media Player: 9
>
> Any Help is greatly appreciated. Thank you in advance.
>